The DDR3 memory range from G.Skill comes highly recommended as it is very stable memory at an affordable price. Most G.Skill memory has room for overcloking and in addition, G.Skill memory often runs well even at low voltages.

4GB DDR3 upgrade kit from the G.Skill NS Value Series. Excellent memory kit rated to run at 1333MHz (PC3-10600) at timings of 9-9-9-24. Voltage of 1.5V which is standard for DDR3 desktop systems. Excellent 4GB DDR3 upgrade kit for mainstream DDR3 based systems.

Had a query before I bought, customer services reassured me this was the correct kit for my Lenovo after trying a competitors unsuccessfully and they were spot on. When I bought it was promptly delivered in good packaging and worked 1st time.